Headline Numbers

As of the latest CDC data release on July 21, 2020 there are:

Where I live, in Somerville, MA, as of July 20, 2020 there are:

Consequently, in the United States, there are now:

Globally, as of the latest WHO data release on July 22, 2020, there are:

Overall Covid Cases In The USA

Regions are defined as follows: Northeast (CT, ME, MA, NH, RI, VT, NJ, NY, PA), Midwest (IN, IL, MI, OH, WI, IA, KS, MN, MO, NE, ND, SD), South (AL, AR, DC, DE, FL, GA, KY, LA, MD, MS, NC, OK, SC, TN, TX, VA, WV) and West (AZ, CO, ID, NM, MT, UT, NV, WY, AK, CA, HI, OR, WA).

US Cases Compared to World Cases

Covid Cases in Somerville, MA and MA

Latest Cases in Boston Area (Today, One Week Ago, Two Weeks Ago)

Date County Name Cases Deaths New Cases New Deaths
July 21, 2020 Middlesex County 25011 1946 53 0
July 14, 2020 Middlesex County 24600 1923 64 2
July 07, 2020 Middlesex County 24243 1888 50 6
July 21, 2020 Norfolk County 9779 970 42 2
July 14, 2020 Norfolk County 9530 959 45 1
July 07, 2020 Norfolk County 9306 941 22 1
July 21, 2020 Suffolk County 20650 1039 29 4
July 14, 2020 Suffolk County 20386 1022 44 2
July 07, 2020 Suffolk County 20048 1008 34 0

New Covid Cases By State

The plot below shows the number of new COVID cases by state. Note that each figure has its own y axis; this is done so that trends can be seen within each state. Log scales can make the difference between 100 and 1000 cases hard to discern and a common y axis causes states like NY and CA to swamp states like NC. Negative new cases can occur when States revise their total number of cases downwards, as Hawaii did between June 30, 2020 and July 1, 2020.

COVID Cases per 1,000 Residents by State

This figure shows the number of COVID cases per 1,000.

Latest County Case Map

Latest County Death Map

Counties with the Most Cases Over Time

Date State County Name Cases Deaths
2020-07-21 CA Los Angeles County 161673 4154
2020-07-21 IL Cook County 99464 4788
2020-07-21 AZ Maricopa County 98988 1556
2020-07-21 FL Miami-Dade County 89557 1325
2020-07-21 NY Queens County 67194 7148
2020-07-01 CA Los Angeles County 105507 3402
2020-07-01 IL Cook County 90911 4581
2020-07-01 NY Queens County 65455 7059
2020-07-01 NY Kings County 59742 7104
2020-07-01 AZ Maricopa County 52266 817
2020-06-01 IL Cook County 78495 3658
2020-06-01 NY Queens County 62094 6271
2020-06-01 NY Kings County 56053 6742
2020-06-01 CA Los Angeles County 55968 2362
2020-06-01 NY Bronx County 45359 4480
2020-05-01 NY Queens County 52274 5111
2020-05-01 NY Kings County 45519 5320
2020-05-01 IL Cook County 38668 1673
2020-05-01 NY Bronx County 37785 3527
2020-05-01 NY Nassau County 36161 1720

Hospitalizations By State

Patients Currently in the ICU

Patients Currently on Ventilators

Cumulative Cases by County in the Northeast

Cumulative Cases by State Over Time

Cumulative Deaths by State Over Time

Daily Percent Positive Cases

According to the WHO the positive rate should be below 5%.1 Days above the threshold are denoted in red, days below are in blue. Note that the variables currently used for these plots –positiveIncrease and negativeIncrease– are being phased out and will be replaced by positiveCasesViral and negativeCasesViral.

Partisanship and COVID Cases

Variants of Select Figures

Week to Week Changes in COVID Cases

Confirmed Cases as a Percentage of State Population

The two sets of points are confirmed cases (black), and potential cases (grey) which are confirmed cases times ten. For herd immunity, typically 70-90% of a population needs immunity.2


  1. https://coronavirus.jhu.edu/testing/tracker/overview

  2. See https://www.jhsph.edu/covid-19/articles/achieving-herd-immunity-with-covid19.html